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Vulnerability report

Active exploitation observed Confirmed confidence Not in CISA KEV

CVE-2026-46442

Flowise Remote Code Execution

FlowiseAI / Flowise · affected before 3.1.2

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Severity
CVSS 9.4 · Critical
Confidence
Confirmed
Exploit status
Observed in sensors
EPSS
36.3%
First observed
13 Jul 2026
Last observed
24 Aug 2026

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2026-46442 is a vulnerability affecting FlowiseAI Flowise. Flowise is a drag & drop user interface to build a customized large language model flow. Prior to version 3.1.2, POST /api/v1/node-custom-function lacks...

Is it exploited?

Yes. Previdian sensors observed exploitation attempts with confirmed confidence.

Who is affected?

FlowiseAI / Flowise affected before 3.1.2.

What should we do?

Patch immediately, validate internet-facing exposure, and monitor for matching requests.

Overview

Flowise is a drag & drop user interface to build a customized large language model flow

Flowise is a drag & drop user interface to build a customized large language model flow. Prior to version 3.1.2, POST /api/v1/node-custom-function lacks route-level authorization, allowing any authenticated user or API key to submit arbitrary JavaScript to the Custom JS Function node. When E2B_APIKEY is not configured — the common deployment case — Flowise executes this code inside a NodeVM sandbox.

This sandbox can be escaped, allowing an attacker to reach the host process object and execute system commands via child_process. The result is authenticated remote code execution on the Flowise server host. This issue has been patched in version 3.1.2.

Vendor Product Affected Status
FlowiseAI Flowise Before 3.1.2 Affected
Published
08 Jun 2026
Exploitation Reported
13 Jul 2026
Attack vector
Remote
Complexity
Low
Privileges
Low
User interaction
None

Tags

nuclei_scanner

CVE References

Exploitation evidence

Why Previdian marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

Previdian

Recorded 13 Jul 2026

Independent exploitation attestation added to the Previdian record.

Active exploitation observed

Previdian sensor

First observed 13 Jul 2026

First-party sensor telemetry confirms matching exploitation attempts.

Proof of concept available

GitHub

Recorded 17 Jul 2026

Public scanner or PoC coverage increases practical exploitability.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

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Source Added
Previdian First 2026-07-17 07:51 UTC

Operational indicators for this CVE are listed under Detection.

Sensor telemetry

First-party evidence of exploitation activity

Aggregate observations show the scale, recency, and distribution of activity without overstating sparse data.

31

Attempts observed

13

Unique attacker IPs

8

Attacker countries

AT · CA · DE · IN · JP · NL · RO · US

1

Sensors observed

Exploitation attempts over the last 45 days

Daily events observed by Previdian sensors

Updated 25 Aug 2026

0
4
0
0
3
15
14
1
6
7
0
0
2
0
0
0
2
3
0
0
2
3
0
0
0
0
0
0
0
0
0
1
3
0
0
0
7
0
0
0
1
0
6
3
0
12 Jul 21 Jul 30 Jul 8 Aug 25 Aug

First observed 13 Jul 2026 · Last observed 24 Aug 2026

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Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
1
User-Agents
23

Raw values available in Pro and Enterprise.

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

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Attacker IP Indicators

Attacker IP indicators observed · available in Pro and Enterprise.

Sensor-derived attacker IP indicators are available to Pro and Enterprise accounts under Detection and through the Pro API.

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Scanner Artifacts

Scanner and exploit-framework references linked to this CVE.

Scanner Reference Detected
Nuclei https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-46442.yaml 21 Jul 2026

Risk and context

Severity, weaknesses, and research context

CVSS v4.0

9.4 Critical
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

EPSS

36.3%

Weaknesses

Improper Control of Generation of Code ('Code Injection') CWE-94

Recent mention · Github Advisory Database (NPM)

[flowise-components] Flowise: CSV Agent Remote Code Execution via Pyodide Code Injection — Root Shell Verified

UPDATE 2026-05-20: Full RCE as root VERIFIED This is not theoretical — a Meterpreter reverse shell session as root has been established on Flowise 3.1.2. Verified Exploit Chain Python code injection via base64_string = "${base64String}" (CSVAgent.ts line 161) Pyodide js...

Read full advisory

All CVSS Scores

CVSS v4.0 9.4 Critical

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

CVSS v3.1 9.9 Critical

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

All Mentions

Recent mention · Github Advisory Database (NPM)

[flowise-components] Flowise: CSV Agent Remote Code Execution via Pyodide Code Injection — Root Shell Verified

Github Advisory Database (NPM) · 04 Aug 2026

UPDATE 2026-05-20: Full RCE as root VERIFIED This is not theoretical — a Meterpreter reverse shell session as root has been established on Flowise 3.1.2. Verified Exploit Chain Python code injection via base64_string = "${base64String}" (CSVAgent.ts line 161) Pyodide js bridge provides access to the host Node.js process process.mainModule.constructor._load('child_process') loads child_process (bypasses ESM require restriction) .execSync('CMD') executes arbitrary OS commands as root (PID 1 in container) Working RCE Payload ";import...

Recent mention · Github Advisory Database (NPM)

[flowise] Flowise: CSV Agent Remote Code Execution via Pyodide Code Injection — Root Shell Verified

Github Advisory Database (NPM) · 04 Aug 2026

UPDATE 2026-05-20: Full RCE as root VERIFIED This is not theoretical — a Meterpreter reverse shell session as root has been established on Flowise 3.1.2. Verified Exploit Chain Python code injection via base64_string = "${base64String}" (CSVAgent.ts line 161) Pyodide js bridge provides access to the host Node.js process process.mainModule.constructor._load('child_process') loads child_process (bypasses ESM require restriction) .execSync('CMD') executes arbitrary OS commands as root (PID 1 in container) Working RCE Payload ";import...

Potential Proof of Concepts

These PoCs are unverified and could contain malware. Use at your own risk.

Flowise < 3.1.2 - node-custom-function Unauthorized RCE

nuclei · Created Unknown

Timeline

From disclosure to observed exploitation

  1. Public PoC available

    Public proof-of-concept code published

  2. Nuclei template available

    Scanner coverage available

  3. Observed by Previdian sensors

    Evidence-backed exploitation signal

  4. Indicators of compromise added (32)

    Indicators of compromise recorded

  5. CVE published

    Vulnerability disclosed publicly

  6. CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2026-46442

Free JSON includes basic KEV fields 
{
  "cve_id": "CVE-2026-46442",
  "confidence": "Confirmed",
  "cvss_score": 9.4,
  "cvss_estimated": false,
  "epss_score": 0.3634,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": true
  },
  "sensor_telemetry": { "attempts": 31, "sensors": 1 }
}

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